Best Insulation Under Concrete Slab

I wouldn t go as far as saying you couldn t use spray foam below a slab but i m not sure why you d want to.

Best insulation under concrete slab.

Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place. Exterior concrete slab insulation options it is good practice to insulate concrete slabs in cold climates to protect the slab from frost penetration. Best seller owens corning foamular 250 2 in. Home depot does sell the right solution for residential concrete slab insulation.

There are a number of different factors at play but the one thing that we always need to keep in mind is heat flow. Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available insulation materials. Builders with a bigger budget especially those in cold climates should consider installing continuous horizontal insulation under the entire slab. Prodex exhibits less than 9 compression in thickness when subjected to loads associated with standard concrete floor systems.

Under slab 5 more ways to filter. R 10 scored squared edge. Foamular provides r 5 per inch of thickness winter and summer. Heat flows from hot to cold and in the.

Prodex total under concrete insulation is ideal for concrete slabs radiant floors and driveways. Foamular 250 foam board. If you want to save money you can install a 4 ft wide band of horizontal r 10 or higher insulation at the perimeter of the slab in a picture frame configuration. Target an appropriate compressive strength.

For under slab applications the rigid foam insulation typically should be installed over a gravel base with a poly vapor diffusion retarder between the gravel and insulation. Cement 3 concrete 4 existing drywall 2. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Their researchers found that xps insulation installed below grade for 15 years had absorbed 67 percent or more moisture.

The insulation is then laid followed by a polythene separating layer and either a concrete screed or tongue and groove chipboard ready to receive the specified floor finish. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost.